Dry concentrator.



L. A. W. JOHNSON.

DRYl CONCENTRATOR.

APPLIOATION FILED JULY s1, 19094 nmmwm) MAB. 1a, 1912. l, 1 05,977.

Patented Aug..4, 1914 ----Ii.l-| ---11---IIIIIIIWM 4 SHEETS-SHEET 1.

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L. A. W. JOHNSON.

DRY CONCENTRATOR.

APPLIoATIo.. FILED JULY a1, 1909. nnnnwnn MAB. 1a, 1912. 1, l 05,977.

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L. A. W. JOHNSON.

DRY GONCBNTRATOR.

APPLICATION FILED JULY a1. 1909 RBNEWBD MAB. 18, 1912.

Patented Aug. 4, 1914 SHEETS-SHEET 3.

rf-u. QI I l I s l I 2 l l I l l l l l l l L. A. W. JOHNSON.

DRY GONGBNTRATOR.

APPLICATION FILED JULY 31, 1909 RBNBWBD MAR. 1a, 1912.

Patented Aug. 4, 1914.

4 SHEETS-VSHEIIT 4.

.UNITED STATES PATENT OFFICE.

LEWIS A. W. JQHNSON, OF LUS ANGELES, CALIFORNIA.

DRY CONCENTRATOB.

Patented Aug. 4, 1914.

Application led July 31, 1,909, Serial No. 510,516. Renewed March 18, 1912. Serial No. 684,622.

To all whom it may concern Be 1t known that I, LnwIsVA. W. Jol-IN- SON, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new 'and useful Improvements in Dry Concenf erforations placed close together, the air is Elown up through the riftle bed in a multiplicity of small, independent streams, which allow the precious metal to drop down between the erforations whence said streams issue and all into the pockets. Hence the rilile hed is, during operation of the blast, covered with tiny streams of ascending and descending material presenting somewhat the appearance of the surface of boiling water. A di'erent and less satisfactory result is secured in machines wherein the air is led throughslots and rises in unbroken sheets, for the reason that, in the latter instance, the lighter ortions of the recious metals will be carrled off and lost, instead yot falling into the spaces between the perforations of eachrow.

It will be observed that the oscillation of the riie bed is in the direction of the length of the rows of perforations, so that all of the material bein treated is exposed to the.

ascending blast o air, notwithstanding the impcrforate portions of the bed between the perforations of each row.

A further object bf this invention is to provide improved meansto discharge the concentrates from `the concentrating table after the precious metal has been separated from the substance in which it is found.

My -invention, hereinafter described, is shown inthe accompanying drawings, in which: I

Figure 1- is a side elevation of a-'gold separator embodying my invention, ,parts bein broken away. Flgz 2 is a plan view ofl t e same, parts being` broken away. Fig. 3 is an end elevation. Fig. 4:- is a longitudinal section, partly broken away, of one of .the concentrating troughs with concentrating table having pockets therein. Fig. 6- is a cross section of a concentrating trough and plate, taken on line 5 5 of Flg. 4, 'showingl the trough in its upright or operative position, with a fragmentary portlonof the truck with its lids closed. Fig. 6 1s a rear elevation of the concentrating trough and table, with a fragmentary portion of a removing truck with the lids open tor ythe reception of the concentrates in its lnverted or dumping position, in dotted lines. Fig. 7- is a broken detail plan of the concentrating table or plate. Fig. 8- is a sectional elevation of a concentrating plate, taken on line 8-'8 of Fig. 7.

My concentrator consists essentially of a longltudinal rotating cylindrical screen 10, open at both ends and revolubly mounted in the frame 11. The cylindrical screen has, as shownin Fig. 1, an inclination downwardly from the rear to the front end, so that the material to be separated passes into the cylinder at its upper or rear end through the feed chute 14e; from thence the particles move downwardly toward the front and the particles will pass through the screen into the V-shapcd receptacle or receiver 15 situated below, and such material or particles as are too large to pass through the openings in the cylindrical screen pass' out at the `front `through the discharge chute 16, and are thence conveyed away as wastematerial to the dump. y

Rotary motion is imparted to the cylindrical screen 10 through the bevel gear 17, keyed on the shaft 18 which carries the screen. The gear 17 meshes with bevel gear 19 (Fig. 2) mounted on the shaft 20 which also carries on its other end a sprocket 21. A vsprocket chain 22 (Fig. 1) extends from the sprocket 21 to the sprocket 23 keyed on the shaft`24. Keyed also on the shaft 24 is a pulley 25 and extending upwardly from this pulley is a driving belt 26 (Fig, 1) which is carried by a pulley 27, keyed to the counter-shaft 28, revolubly mounted in bearings above the shaft 24. On this countershaft 28 (Fig. 2) is also keyed a pulley 29, which is connected by a belt 30 with pulley 31 which is keyed on the cam shaft 32. This cam shaft carries four cams 33. These cams afford means to impart a reciprocating motion, on rotation of shaft 82, to the concentrating troughs?, six in'number, disposed -below the cylindrical screen 10,4 and transversely thereto.' T hese troughs are mounted on two supplementary trough supporting frames 40, operatively connected with thecams or eccentrics 33 by the connecting arms 52 lby means of whichV a reciprocating motionis imparted to the troughs, the troughs being secured to the iiat springs 39, -which permit a rocking `or reciprocating motion of the frame 40. The screened material will drop centrally into the concentrating troughs through the discharge chutes 38 on the bottom of the V-shaped receptacle 15 and onto the concentratingl tables 41. The

having perforations for the passageV therethrough of air. Air is admitted into the lower compartment of the vconcentrating troughs through the ports 46, the same being in communication with a supply ofair'under pressure, which is fed to these troughs by means of the air pipe 47, the only outlet for -the air being through the perforations 45, which will cause all the air to pass upwardly through the bottom of the pockets. The bottom plates 44 are provided with a row of perforations 45 disposed, so as to bring these perforations at the top part or "the bottom of the pocket, the larger perforations being disposed below the upper pockets and decreasing in size, 'as shown in Fig. 7,

until the lower pockets are reached, the purpose of which is to force a larger volume of airthrough the upper pockets, and thus impart a greater concentration at this point than if .the perforations were of uniform size beneath the alternate rows of pockets disposed in the concentrating plate. The perforations in the lower series of pockets are so small that the velocity or power of the air is not capable of removing the fine powdered gold or values therefrom, and thereby prevent the same from passing outwardlyl into the Waste to the dump and be lost. These troughs are pivot'ally mountedon a rotatable shaft; 4 8, a crank 49 being carried on `the outer endof the trough, and by means of which the trough can be rotated or'turned upside down. In Fig. 5 the trough .is shown in transverse vertical section`l in its upright operative position. On the Aupper end of the trough a circular head 50' -is mounted through which is formed an opening 51 of a size and configurationzto register with the air inlet port 46, and permit the air to pass from the air reservoir into the lower compartment of the concentratingtroughs when the troughs are in their upright position. rlhe vtroughs are riveted or secured in air tight engagement to the circular heads-50, so as to prevent any air entering the lower part of the trough from passing out, except through the perforations 45 'in the plate, and it will agitate any material in the pockets. The heads are mounted in a circular Seat 58 in the bottom of whichis an opening of a size and configuration similar to opening '51 in the head150 of the trough, and adapted to reglster with openingl when the trough is in its upright position, and on the rotation of the trough will bring the upper and closed part of the head opposite the opening 51 and shut ol" the air from the air supply.

The 'material operated upon drops. down through the Vshaped trough 15 and out through the discharge chutes 38 intok the concentrating troughs upon the concentrating table therein, and the .precious or heavy metals will pass intothe perforations or pockets 42v where they will encounter a current of air passing up through the perforations in the plate. below, and thel lateral or reciprocating motion imparted to the trough onlthe rotation of the cam shaft 28 will thoroughly agitate the material on the concenL trating table, the concentrating tables being operatively connected to the 'cam shaft by the eccentric rods 52 will impart a recipro-y eating vibratory motion tothe concentrating tables and agitate the material therein contained, and the air blast being passed through the bottom thereof upwardly willv prevent anything but the heavy and valuable particles from remaining in the pockets.-

This constant reciprocating movement, together with the air blast will cause the Worthless material to pass downwardly rorer the concentrating tableY out of the trcugh and be dumped upon the delivery'chute 53, whence` the'4 p'articleswill pass out of the concentrator. The openings through the various chutes 38 leading from the V-shaped trough .or receptacle 15 -are regulated' by the valve 54. Now -when the pockets in the concentrating tables are sulicientlyfull of concentrates, the troughs are thrownv from their upright position, as shown in Fig. 5,V

totheirinverted position, as shownin Fig. 6. This is accomplished manually by means of the lever 49. When the concentrating. tables are in the inverted or discharging position, as shown in dotted lines in Fig. 6,

their contents will drop downwardly and out throughl the opening 55 and pass into Athe boxes 56 disposed belowr the concentrating troughs, whence theycan be removed where desired.` A fragmentary portion -of these boxes is shown in'Figs. 5 and 6. In Fig. 5

the lids 57 are shown in their closed position, and in Fig. 6 they are shown in their open position.

The arrangement described for dumping the troughs by rotating them is advantageous because of the dumping throughout their entire length and not at the lower end where the discharge of the gangue usually lakes place. In this Way the trough over which the gangue passes does not interfere with the receptacles for catching the con centrates.

Having described my invention what. I claim as new and desire to secure by Letters Patent is In a separator, in combination, an elongated trougln'fa concentrating table mounted to rotate in said trough on the longitudinal axis of said trough, a substantially circular head rigid with said table and, having a blast port therein, a seat receivingr said head and having a blast opening therein adapted to register with said blast port when said table is in an upright position, and means for rotating said table and said head to throw said port and said opening out of register to cut off the blast and to dump the concentrates from said table. said table having a plurality of concentrating pockets to retain the concentrates, and means-for directing the blast upwardly through said pockets.

In witness that I claim the foregoing I have hereunto subscribed my name this 24 day of July, 1909.

LEWIS A. W. JOHNSON. llritnesses:

EDMUND A. STRAUSE, MYRTLE A. PALMER. 

